How to update service worker?

Question

firebase

Good afternoon, I'm trying to put push notifications on sites, the architecture is as follows:
Sites have files:

<script type="text/javascript" src="//www.gstatic.com/firebasejs/3.6.8/firebase.js"></script>
<script type="text/javascript" src="/firebase_subscribe.js"></script>
<script type="text/javascript" src="/firebase-messaging-sw.js"></script> /* зарегистрированный сервис воркер */

The firebase-messaging-sw.js file contains:

importScripts('https://example.com/api/js/sw.js?v='+(+new Date));

From which the main code of the service worker is loaded.
The question is simple, if there were changes in the file https://example.com/api/js/sw.js , how to tell the signed browser that did not visit the site to update the file?